Determine Switch-Time relative to request time

[blocktrron]

Problem

In case a Mesh network consisting of multiple nodes reconnects into a to-be-emptied source-domain which has a switch time set in the past, the first querying node will reboot pretty much immediately. This is a potential problem as other nodes won't be able to request a target-domain and so the switch-offlien feature will not work

Possible Solution

We should integrate a feature where the meshes switch-time should be determined relative to the query-time of the first node requesting a target domain at the director. A sane setting could be 2-3 days, giving other nodes in the mesh plenty of time requesting the new target domain.

[mweinelt]

In fact I'd suggest waiting for all nodes in the mesh to have the desired target domain set before delivering a switch time. That way we have the fallback migration when connection is lost.

[blocktrron]

We won't. In case no switch_time is advertised (eg. -1), domain switching is completely disabled. Maybe set a switch_time far in the future (1-2 weeks)? We could also decrement the switch_time advertised each time the former one was advertised to all nodes.

[mweinelt]

Drop the global switch time completely. Define

• mesh_discovery_time
• switch_delay

Wait $mesh_discovery_time for a new mesh to discover all its nodes.
Then send all nodes in that mesh the new target domain, but no switch time.
Wait for all nodes in that mesh to have requested the correct target domain, then announce switch time as $now+$switch_delay.